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arxiv: 1404.2839 · v2 · pith:BLM6E7AFnew · submitted 2014-04-10 · 🧮 math.LO

An analogy between cardinal characteristics and highness properties of oracles

classification 🧮 math.LO
keywords analogycharacteristicscardinalhighnesspropertiestheoryanaloguecichon
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We present an analogy between cardinal characteristics from set theory and highness properties from computability theory, which specify a sense in which a Turing oracle is computationally strong. While this analogy was first studied explicitly by Rupprecht in his PhD thesis, many prior results can be viewed from this perspective. After a comprehensive survey of the analogy for characteristics from Cichon's diagram, we extend it to Kurtz randomness and the analogue of the Specker-Eda number.

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